根据句子意思,选择括号中所给词语的适当形式填空。

1. She      (mop) the floor when the pet cat fell asleep．

2. At the very _____ (begin), he found it interesting to study English.

3. It was very clear that he was very angry because he looked at me     (angry).

4. He always tells lies to me. I think he is a ______ (honest) boy, so I can't believe him.

5.Linda's mother      (come) back if she finishes her work this week.